Machine for boring tuft holes in brush blocks



Fd@ @3, E923. l,444,075

vJ.'JENsEN1 MACHINE FoR BORING TuFr HOLES IN BRUSH BLocKs.

FILED APRA 10, |92()A 3 sHEETs-sHEET l @ZM @d Feb. 6, 1923.

11,444,075 J. JENSEN.

MAcH|NE FOR BoRlNG TUFT HOLES 1N BRUSH BLocKs.

F|LED AFR. 20, 1920.

3 SHEETS-SHEET 2 Feb. 6, 11923., LQVAWTS J. JENSN. MACHINE FoR BORING TUFT HOLES N BRUSH BLocKs.

FILED APR. 20. 1920. 3 SHEETS-SHEET 3 [wref: fur.'

Jef/J Je nsc'n Patented lieb ti, lgfw".

JENS JENSN, OF THISTED, DENMARK.

.ll/IACHNE FOR BORING TUFT HOLES IN BRUSH BLOCKS.

application and lim-n 2c, 1920.

T 0 all whom it may concern:

Be it known that l, JnNs JnNsN, a subject of the King of Benmark, residing at rlilsted pr. rlhisted, Denmark, have invented a new and user'ul improvement in Machines for Boring Tutt Holes in Brush Blocks; and l do hereby declare the following to be a full, clear, and exact description of the same.

The invention relates to a machine for the automatic boring of tutt holes in bushblocks by a system of cams and levers, whereby it is possible to bore the holes with the desired inclination and spacing irrespective ot whether the wood has a plane suri'ace or a surface curved transversely or longitudinally, or both.

By virtue of my invention it is possible to bore, by means of a single automatically operating machine, brush-blocks with the holes in any single row either parallel, divergent, convergent or having any combination of these three arrangements.

ln order to bore the holes in a brush-block, when the boring shaft is journaled in fixed bearings, in such manner that the holes may have the right direction, it is necessary to impart to the work-table three dierent motions. By the present invention, this is attained by means oli three cam wheels ot' suitable shape and levers with rolls ruiming on the cam wheels, said levers being operatively connected to the work-table and moving it in three different directions. @ne motion is a rocking motion of the work-table and the work carried thereby with a lined guide or support opposite to the bit of the drill as the fulcrum point for the rocking motion. The second motion is edected in the longi tudinal direction ot the work-table and the third motion in the lateral direction thereof. During all of these motions the work-table and the work are guided by the xed guide or support.

The invention is illustrated in the accompanying drawings, in which- Figure 1 is a view in side elevation oi' the machine;

Figure 2 is a top plan view of the machine, the right-hand portion thereof being shown in horizontal section;

Figure 3 is a vertical sectional view ot the machine taken on the line iii- Ac or" Figure 1 looking in the direction orn the arrows;

Figure el is an end view of the machine looking Jfrom the left, Figure l;

Figures 5 and 6 are detail views on an Serial No. 375,299.

enlarged scale of a modified form of worktable;

Figure 7 is a view on an enlarged scale ot the work-table shown in Figures 5 and G and co-operating parts of the machine;

Fig. 8 shows a bored brush-block in elevation;

Figs. 9 and 10 are sectional views taken on the lines 9 9 and 10--10, respectively, ot F ig. 8.

Figs. 11 and 12 are views illustrating the configuration or" each of the cam disks 24, 29 and 37 used for boring the brush-blocks shown in Figs. 8, 9 and 10, these views illustrating also the manner in which these disks cooperate in timed relation with their respective levers 26, and 39.

rlhe machine comprises a trame 1 in which is mounted, in suitable bearings, the boring shaft 2, provided with the chuck 61 for the drill 62 and carrying pulleys 3 and d. rl`he pulley l is driven through a belt 5 from the source of power ot the machine. From the pulley 3 a belt 6 runs to a pulley 7 loose on a shaft 10, said loose pulley also constituting a friction member. A friction disk 9 splined to the shaft l() is adapted to be pressed against the friction face or pulley Z by a spring S so as to cause the shaft 10 to be rotated with the pulley.

1`he shaft ill) carries a pulley 11 from which the pulley 13 is driven through a belt 12, said pulley 13 being iormed with a face cam 14. A lever 16 is pivoted at its lower end to the frame 1 and carries at its upper end a roll 15 held in engagement with the `face-cani 14 by a coil spring 17 connected one end to the lever and at its other end to the trame 1. The lever 16 is connected to the shaft 2 to impart reciprocatory motion there to while permitting said shaft to rotate.

The pulley 13 is fixed on the end of a snat 18 on the other end of which is carried a bevel pinion 19 in mesh with a similar bevel pinion 19 mounted on the end of a shaft 20 arranged at right angles to the shaft 18. The shaft 20 carries a worm 2l, the thread ci. which is perpendicular to the axis of the shalt 20 Jor about two-thirds of the circumference of the worm, the remaining part of the thread having a pitch corresponding to the tooth spacing of the worm-wheel 22, the latter being driven by said worm 21.

lt will be seen that for each complete rev elution of the shaft 20, the worm will drive the worm-wheel 22 a distance meas- A adjacent the worm-wheel 22 and a lever 26 pivoted at one end on a bolt 2T has a roll 25 in engagement with the edge ol said camwheel. lthe lever 26 is made in two sections secured together by the bolts L6 as shown in Figures 6 and '7.

The 'tree end of the lever 26 extends through an elongated slot 54 in one end ont a lever 28, also mace in twoparts which are pivotally connected at 36. To the other end of the two-part lever 28 is lined the. worktable 34 which carries the worlr 35 in the form of a brush-block. rl"he rear tace ol the work is engaged by the ballshaped or semiball-shaped end ot a tired guide or support 46 and the roll 25 running on the edge ot the cam-wheel 24 causes the work-table and the work to slide on said lined guide or support, the lever 28 being guided in its vertical movement between lixed arcuate plates 33.

On the end of the shalt 23 opposite that carrying the cam-wheel 22 isi'ixed a camwheel 29. A lever 32 pivoted at one end on a bolt 3l carries a roll 3() arranged to engage the edge oit said cam-wheel. fr coil spring 45, iXed at one end to the traine l and at its other end to the lever 23, exerts a rearward and downward pull on said lever tending to maintain the work B5 in engagement with the guide a6 and the roll E() in engage ment with the cam-wheel 2%). 'lhe tree end ot the lever 32 is bil'urcated and receives between its branches the lever 28, whereby the lever 82 is adapted to move the lever 28 upwards and downwards between the guide plates 33 in order to impart to the worktable 34 and work 35 movement in the longitudinal direction ol the work-table (the direction ot the arrow a, Figure lSuch movements ol the lever 28 taires place about the free end of the lever 26 as a pivot.

Fixed to the cam-wheel 29 is a smaller cam-wheel 37, contacting with the peripheral edge ot which is a roll "o 39, the latter being pivoted at one end on a bolt lll. The lever Si) is connected at its opposite end to a rod all. sliding in bearings 42. The slide-rod carries at one end a guidebar -l engaging the edge oit the woik-table 34. liVhen the rod el and vulde-bar e3 are moved forwards and backwards, the worktable 34: is moved forwards and bacliwznds on the tired guide or support (the direction or the arrow 7), Figi'ire 3), such morements or the worlr-talde being permitted by no carried by a lever reason of the joint or pivot 236 in the lever 2S. t coil spring fleiis connected at one end to the lever 28 and at its other end to the lever The spring te exerts its tension to press the work-table Sel against the guidebar thereby displacing the rod el in its bearings 42 so that the roll of lever 39 is pressed against the cam-wheel 37.

'lhe fixed guide or support 46 has its ball shaped or semi-ball-shaped head arranged coa-Xially with the drill 62, so that all the holes bored in the work 35 end at the same distan from the guide, notwithstanding the motion in the dilierent directions ot the work. 'lhe lilzed guide or support i6 is capable of adjustn ent on the trame l to vary the distance or its head from the bit ot the drill.

When the worm-wheel 22, which has teeth corresponding in number to the number of holes to be bored in the work 35, has made one revolution, a roll t6 carried on an arm el?, lined to and rotating with the shaft 23, contacts with the end of a lever arm i9 roel;- ing the latter on its pivot 49 and thereby causing the displacement oi. a rod 50 in the direction olf the arrow l), Figure l, said rod being niif'otallv connected at one end to the opposite end olt the lever a9. The tree end ot the rod 50 is in engagemeiit with the end of lever :3l pivoted at 5l on the trarne l and, when Said rod 50 is displaced in. the direction olf the arrow lo, the lever is rocked on its pivot. The lever 5l engages a disk 53 connected with the 'friction dish 9 and the rocking movement ot the lever 5l caused by the displacement olf the. rod 5U causesthe friction dish 9 to be moved out ot engagement with the pulley i thereby stopping the slialt l() and the mechanism driven thereby while the drill, however, continues to rotate. The iinished brush-bloei; may now be removed frein the \vorlr-table and another sub stituted therefor, wl'iereupoii the lever 5l may be moved manually by the handle 52 to release the friction disk 9 so that the operation or the machine may be renewed.

lrilorlr-tables et' diil'erent construct-ions may be used in the machine. ln Figure l a simple worletable is shown and in Figures 5 and 6 a universal table 31K; ln the latter the work does not eng the lined guide or support lt, but on the contrary the work-table 34; or a plate 62E or 63" arranged on the saine, engages the guide. For the plates 63 or (33 may be substituted other plates o'l shapes cont' igent on the worlr to be operated on, so that it is possible to opn crate with any hind et wo u, whether the same has a plane sur'E ce or lace curved lonrf'itinlina y or trainrverselyor both.

ie oblong hole in the end ot the lever r the recep ion ol" the end ot the lever )ermite the lever 2d t more longitudiy indepenrenlly et the lever 26 as the b nal different plates 63, 63, or the work-table 34 or 34 or the work :55 is moved over the lived guide 46 by the cams 29 and 37 and their cooperating rolls and levers.

In the construction shown in Figures 5, 6 and 7, the lever 28, like the lever 28 oi Figure 1, is in two parts, the parts being connected by a U-shaped member 64, to the horizontal arms 65 or which are pivotally connected by means oit bolts 57, the links 66 which carry the universal table 34. rlhe arms 65 and links 66 are each provided with a number ot holes 58 so that by shifting the pivot bolts 57 to diil'erent holes, the radius ol the movement or the table 34 caused by the cam wheel 3T and co-operating parts can be varied. In this form of the construction, the coil spring 44 is not used, but instead two torsion coil springs 59 iXed upon arms 67 carried by the U-shaped member 64 and having their free ends in engagement with the links 66.

A. roll 60 is arranged on the lever 28 or 28 between the guide plates 33 to reduce friction and the levers 26, 32 and 39 are provided at their pivot ends with a. number or' holes so that by shitting the pivot bolts 27, 31 and 40 to dilerent holes, the space between the holes to be bored in the work can be altered by degrees without any alteration ot' the cam-wheels.

. The construction which has been described is for boring the holes in brushblocks for street brooms, in which the holes in certain rows are to be bored at special angles, as illustrated in Fig. 10 in whichy the holes are partly convergent and partly diverOent, and in which the holes in certain other rows are to be either parallel, or slightly divergent as illustrated in Fig. 9. Prior to his invention it was impossible to bore with a single machine brush-blocks with holes having these three dil'erent arrangements. In other words, in brushblocks bored by means of the known Inachines, the axes or the different holes in any longitudinal row of holes radiate from a single point or are, at least, divergent. To bore parallel holes or holes which are partly convergent and partly divergent it has before been necessary to use special types of machines or two or more machines foreach brush-block.

The main advantage ot my machine isv the holes having the arrangementillustrated in Fig. 9. .By the addition olI the lever 26, holes arranged as illustrated in Fig. 1() or holes with their axes parallel may be bored.

Referring to Figs. 11 and 12, the timed relation between the cams 24, 29 and 37 is illustrated 'for boring'oi a brush-block with the holes arranged as illustrated in Figs. 8, 9 and 10.

Take, tor instance, the boring of the holes i to 1l, inclusive, ot an outer row. It will be seen that the rollers 25 and 38 on the levers 26 and 39 move over concentric portions of cams 24 and 37, respectively, while the roller 30 on the lever 32 is moving` over an eccentric portion of the cam 29. Theretore, the lever 28 is tilted about the end or' lever 26 as a fixed pivot and the holes 1 to 11, inclusive, are bored with their axes diverging. Consider next the boring ot the holes 12 and 19. It is seen that the rollers 25 land 30 move over concentric portions of the cams 24 and 29, so that the axes or the holes 12 and 13 have the same inclination as the axis of the hole 11, while the roller 38 moves over eccentric portions or the cam 37 in order to shift the work holder 34 laterally for the proper spacing of the holes 12 and 13. irgain, consider the boring of the holes 18, 19, 2O and 21. While the roller 38 is moving over a concentric portion of cam 37, the rollers 25 and 30 are moving over eccentric portions of the cams 24 and 29. It will thus be seen that the cam 29 will cause the lever 28 to be moved about the end ot' lever 26 as a pivot tor spacing the holes 1S, 19, 2O and 21, while the cam 24 will cause the lever 28 to be moved about the end ot lever 32 as a pivot in order to properly incline the axes ot' the bored holes. It is quite evident that it cams 24 and 29 are selected having corresponding portions adapted to move the tree ends of the levers 26 and 32 equal amounts, then the lever 28 will simply assume different positions parallel to itself and, therefore, holes will be bored having their axes parallel.

Having now described my invention what I claim is 1. A machine for drilling brush blocks, comprising a block holder, means tor swinging said block holder about an axis, to shift the block in said holder longitudinally to thereby space the holes of a row, and means for swinging said block about a substani' tially parallel axis, to give the holes in said row the desired inclination, both axes being located at a nnite distance.

2. A machine for drilling brush-blocks, comprising aA block holder, a lever pivoted at one end to the trame or' the machine, a second lever pivoted at one end to the tree end oi said first-mentioned lever and carrying said block holder at its opposite end, a third lever pivoted at one end to the Jframe lever about the free end of said iirst-inenn tioned lever to shift the block in said holder longitudinally to thereby space the holes of a row, and a @am for actuating said irstmentioned lever to swing said second lever about the free end of said third lever to give the holes in said row the desired inclination.

3. A machine as in claim 2, the said second lever comprising two parts, hinged together, one part swinging in a plane for spacing the holes of a row and the other 15 swinging in a plane perpendicular to the iirst named plane, for spacing the rows of holes.

4. A machine as in claim 1in combination with a drilling element having means for moving the same relative to the block holder..

In testimony whereof Ihave axed my signature in presence of two witnesses.

JENS JENSEN. l/Vitnesses:

VIGGo BLOM,

C. V. HGs'rED. 

